Earning a high level of income in general already signifies that a person is contributing to society in a meaningful way. Their income is reflective of the service provided to others.
All corporations exist to better the lives of people. Their purpose is to earn profit for shareholders (ultimately, people), but how do they accomplish that? Mostly, by making useful goods or selling useful services. A consumer will then buy one of these goods or services because that consumer has decided the value of the good/service to them is greater than the value of the dollars they'd need to pay for it. E.g., If you have decided to buy a car for $10k cash, then you have decided that having the car now is more valuable to you than having $10K USD now. The fact that the car exists and is available for sale has thus enriched your life, by giving you the option to buy it. The car's makers are providing a service to others.
As a result of each purchase, both sides ends up with greater total value than they had before. When people trade, both are better off.
A tremendous income generally comes from delivering tremendous value in the world to others. There are many layers of indirection involved, so it's difficult to see for one's self how one's job (like an office job or financial job) improves the lives of others in the general case, but through trickle-down effects it always does if you follow cause and effect through enough steps.
Or for a clear and notable example, consider the game of Minecraft. It was largely developed by a single individual, Markus Persson aka Notch. He sat down and used his game development skills to produce something marvelous. Many people came along and each decided to pay Markus $X for his game Minecraft, and since over 100 million copies have been sold, Markus became a billionaire. Many people found great enjoyment in the game, and Markus gained a great number of dollars.
In general, tremendous income results from delivering tremendous value. Our society is working correctly and incentivizing the right things if this is the result of ethical business dealing. Sometimes people get rich through scams, fraud, theft, and other shady dealings, but in a society with law and order, this is the exception rather than the rule.
